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American Focus > Blog > Tech and Science > Has Dementia Risk Declined Over Generations? Here’s The Science. : ScienceAlert
Tech and Science

Has Dementia Risk Declined Over Generations? Here’s The Science. : ScienceAlert

Last updated: June 25, 2025 3:26 pm
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Has Dementia Risk Declined Over Generations? Here’s The Science. : ScienceAlert
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Dementia is a growing concern worldwide, with over 57 million people currently affected by the disorder. According to projections, this number is expected to increase to 78 million by 2030 and 139 million by 2050. However, a recent study has suggested that dementia risk has actually declined with each generation, sparking both surprise and skepticism.

The study analyzed data from 62,437 individuals aged 70 and over from three longitudinal cohort studies on aging conducted in the US, Europe, and England. By comparing probable dementia diagnoses across eight different generation cohorts, the researchers found a decrease in dementia cases for each subsequent generation. For example, in the US, 25% of individuals born between 1890-1912 developed dementia, compared to only 15% of those born in the most recent cohort (1939-1943).

While these findings are intriguing, there are several factors to consider. The study focused on high-income countries where dementia can be better diagnosed and cared for, potentially skewing the results. Additionally, the study did not differentiate between different subtypes of dementia, such as Alzheimer’s disease, which can present with different symptoms and progression.

As the global population ages and grows, the number of people living with dementia is expected to increase. This is particularly true in low- and middle-income countries where healthcare infrastructure may be lacking, leading to greater risk factors for dementia. Socioeconomic disparities and health inequalities may also contribute to the risk of developing dementia, further complicating projections for future generations.

While the study’s findings are intriguing, it is essential to interpret them with caution. Dementia remains a significant global health concern, and as current generations live longer, the likelihood of developing the disorder may actually increase. More research is needed to fully understand the complex factors influencing dementia risk across different generations.

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This article was written by Clarissa Giebel, a Senior Research Fellow at the University of Liverpool, and is republished from The Conversation under a Creative Commons license.

TAGGED:DeclineddementiaGenerationsHeresRiskScienceScienceAlert
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